# std::atomic_store, std::atomic_store_explicit

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< cpp‎ | atomic

Defined in header `<atomic>` |  |
template< class T > void atomic_store( std::atomic<T>* obj, typename std::atomic<T>::value_type desired ) noexcept; | (1) | (since C++11)
template< class T > void atomic_store( volatile std::atomic<T>* obj, typename std::atomic<T>::value_type desired ) noexcept; | (2) | (since C++11)
template< class T > void atomic_store_explicit( std::atomic<T>* obj, typename std::atomic<T>::value_type desired, std::memory_order order) noexcept; | (3) | (since C++11)
template< class T > void atomic_store_explicit( volatile std::atomic<T>* obj, typename std::atomic<T>::value_type desired, std::memory_order order) noexcept; | (4) | (since C++11)

1,2) Atomically replaces the value pointed to by obj with the value of desired as if by obj->store(desired).
3,4) Atomically replaces the value pointed to by obj with the value of desired as if by obj->store(desired, order).
If order is one of std::memory_order_consume, std::memory_order_acquire and std::memory_order_acq_rel, the behavior is undefined.

### Parameters

obj | - | pointer to the atomic object to modify
desired | - | the value to store in the atomic object
order | - | the memory synchronization ordering

### Return value

(none)

### Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR | Applied to | Behavior as published | Correct behavior
--- | --- | --- | ---
P0558R1 | C++11 | exact type match was required because `T` was deduced from multiple arguments | `T` is only deduced from obj

### See also

store | atomically replaces the value of the atomic object with a non-atomic argument (public member function of `std::atomic<T>`)
atomic_loadatomic_load_explicit (C++11)(C++11) | atomically obtains the value stored in an atomic object (function template)
memory_order (C++11) | defines memory ordering constraints for the given atomic operation (enum)

std::atomic_store(std::shared_ptr) std::atomic_store_explicit(std::shared_ptr) (deprecated in C++20)(removed in C++26) | specializes atomic operations for std::shared_ptr (function template)
C documentation for atomic_store, atomic_store_explicit

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